/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/MoviePipeline.h
This function should be called by the Executor when execution has finished (this should still be called in the event of an error)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Movie Render Pipeline") virtual void OnMoviePipelineFinishedImpl()